Have a 2017 29h. I recommend to keep trouble shooting First are you looking at the bat voltage at the main panel (same place as fresh,gray,black levels) or the inverter? You said yellow light , that's the inverter (12v to 120 for the tvs)
The store, use switch must be in use to connect the converter to coach batteries.
The inverter does NOT go through the store switch.
Their are three circuit breakers mounted on the outside of the battery box, under the coach. One of them is for the inverter, one for generator and the third I don't know. Check and make sure none are tripped.
Let us know what the empty full batt indicator shows.
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